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Home >> Audi >> 2019 >> Q7 Prestige >> Repair and Diagnosis >> Brakes >> Parking Brake System >> General, Technical Data (Brakes) [CREC,CUEA,DDEA,CYMC] >> 00 General, Technical Data >> Brake Inspection >> CERAMIC BRAKE ROTOR, DETERMINING WEAR USING Carbon-Ceramic Brake Wear Tester: VAS6813 >> CHECKING WITH Carbon-Ceramic Brake Wear Tester: VAS6813

CHECKING WITH Carbon-Ceramic Brake Wear Tester: VAS6813

Special tools and workshop equipment required 

NOTE:

The check occurs by determining the brake rotor thickness "and" the wear value with the Carbon-Ceramic Brake Wear Tester: VAS6813  , both must be measured three times respectively around the circumference.

The wear value -C- for the Carbon-Ceramic Brake Wear Tester: VAS6813  is engraved on the brake rotor cup.

Fig 1: Wear Indicator A Through D
GWWA00-11145Courtesy of AUDI OF AMERICA, LLC

The values -A and C- can be different depending on the location.

The values -A and C- can be different depending on the brake rotor.

Value -A- is a value from the production of the new brake rotor

Carbon-Ceramic Brake Wear Tester: VAS6813  :

NOTE:

For additional information on the Carbon-Ceramic Brake Wear Tester: VAS6813  refer to the supplied Owner's Manual.

Measurement:

WARNING:

Health Risk.

  • Always wear a mouth and nose mask when using compressed air to clean the ceramic brake rotor.
  • Never clean the brake rotor with water or any other fluid.

At a distance of 120° the marks for the measurement for deterring the wear can be found

The following described measurement must take place on all three measurement locations to guarantee a correct check.

-A- new value, -C- wear value, -B- number of the measurement location, -D- mark for the laser beam for the measurement of the wear value.

Fig 3: Wear Indicator A Through D
GWWA00-11145Courtesy of AUDI OF AMERICA, LLC

For example the third measurement location -B- from "1 to 3" can be seen.

NOTE:

The values -A and C- are different depending on the location.

The values -A and C- are different depending on the brake rotor.

-- Place the Carbon-Ceramic Brake Wear Tester: VAS6813  flush on the outer edge of the brake rotor.

-- Switch on the Carbon-Ceramic Brake Wear Tester: VAS6813  .

-- Move the Carbon-Ceramic Brake Wear Tester: VAS6813  -1- along the outer edge -2- until the laser beam points exactly on the mark -D- on the brake rotor.

GWWA00-11146Courtesy of AUDI OF AMERICA, LLC

-- Determine the wear on all three measurement locations of the brake rotor from "1 to 3".

-- Read the displayed value on the Carbon-Ceramic Brake Wear Tester: VAS6813 

If one of the three wear values -C- is reached or falls short, the brake rotor must be removed for further checking.

Fig 4: Wear Indicator A Through D
GWWA00-11145Courtesy of AUDI OF AMERICA, LLC
NOTE:

The wear value -C- is different depending on the measurement location.

-- Remove the brake rotor.

NOTE:

To avoid false measurement, place the brake rotor on a non-electrically conductive surface (for example a wooden table).

The surface must be clean and dry

The brake rotor must be clean and dry

-- Place the Carbon-Ceramic Brake Wear Tester: VAS6813  again flush on the outer edge of the brake rotor.

The measurement must take place again on all three measurement locations to guarantee a correct check.

-- Move the Carbon-Ceramic Brake Wear Tester: VAS6813  -1- back along the outer edge -2- until the laser beam points exactly on the mark -D- on the brake rotor.

GWWA00-11146Courtesy of AUDI OF AMERICA, LLC

-- Determine the wear on all three measurement locations of the brake rotor from "1 to 3".

-- Read the displayed value on the Carbon-Ceramic Brake Wear Tester: VAS6813 

If one of the three wear values -C- is reached or falls short the brake rotor must be replaced.

WARNING:

Risk of accident due to insufficient braking effect.

  • Ceramic brakes should be replaced when, one of the defined wear limits is reached. The brake rotor can no longer be driven.

If a brake rotor is damaged or worn, check the other brake rotors for damage and wear.